Stone-dressing machine



(Model.)

K l 3 Sheets-Sheet 1. W. PERKINS. 's'ToNB DRESSING' MACHINE. No.291:,07a

Patentfadan. 1,1884

(Model.)

l 3 Sheets-Sheet 2. WA.,PERKINS. STONE DRESSINGMAGHINB.

Patented Jai-51,1884.

(Model.) sfsheets-sheet.

v- W.1 ERK1NS.

STONE DRESSING MAGHINE.

No. 291,07;V

1,7m n 2 we UNITED i STAT-Es' 'PATENT DREI-CEo WHEELER PERKINS,` or-METHUEN, MAssAcHusEr'fr's.

STONE-DRESSING MACHINE.

VSPECIIE`ICA'JIION forming part of Letters Patent No.- 291,078, datcdJanuary 1, 1584.V Application filed June 23, 1983. (Model.)

To all whom t may con/cern Be it known that LVWHEELER PERKINS, a citizenof the United States, residing at Methuen, in the county of Essex andState of Massachusetts, have invented certain new and usefulImprovements in Stone-Dressing Machines; and I do hereby declare thatthe following is a full, clear, and exact description of the same,reference being had to the annexed drawings, making a part of thisspecification, and to the letters and iigures of reference markedthereon.

Figure 1 of the drawings is a perspective view of my invention; Fig. 2,a top plan view; Fig. 3, a cross-section, and Fig. 4 a detail view of abox for tools employed in cutting rounded surfaces.

This invention relates to certain new and useful improvements in stonecutting machines, the object thereof being to provide such a device,simple in its construction and effective in its operation, that will beapplicable for work upon either plain or rounded surfaces,the stonebeing automatically fed to the cutters, and their stroke easilyregulated, one, two, or more cutters being employed to strike the stone,as the necessities of the work may require. These objects I attain bythe construction substantially as shown in the accompanying drawings,and hereinafter more fully described.

In the drawings, A represents a suitable frame, having secured theretoabcd, B. Centrally hung in this frame is a driving-shaft,C, providedwith suitable pulleys, over which work belts communicating with pulleyson eccentric shafts D, hung at the ends of the frame, these eccentricshafts operating hammers E, which strike the spring cutter-arms F,loosely hung upon shafts a. Aflat spring, b, located under eachcutter-arm, serves to liit the same after being struck with itsrespective hammer, and suitable yokes, c, secured at one end to the bedB, and connected at the other with theirindividual hammers, serve toguide said-hammers,V and add to the effectiveness of their stroke.

Secured to the free ends of the spring cutterarms F are suitable heads,d, to which are removably connected the cutters or chisels e, whichstrike thestone through an opening, G, made in the center of the bedB,said stone being mounted on a carriage, H, running on a central track,I, and operated by any suitable feed-motion to bring the stone under thechtters, and automatically move the same at each revolutionl of thedriving-shaft C. The feedmotion in this instance consists of a pinion,f, meshing with teeth or projections upon thc side ofthe carriage, saidpinion being driven by a belt connecting with the driving-shaft.

Working in suitable grooves 'formed in the upper surface of the bed Bare sliding blocks g, arranged under the spring cutter-arms F, andoperated by levers 71., said sliding blocks serving to regulate thedepth of the cut by having their upper faces inclined toward the openingG of the bed, and thus when moved forward prevent the cutter-heads frombeing driven down farther than such inclination will with andterminating some distance above the upper surface of said bed, so as tocome directly under the rear portion of the cutterheads d when theirlevers 7L are operated.

In the operation of my invention the stone is placed upon the carriageH, and the depth of the cut regulated by the sliding blocks g. Powerbeing suitably applied to the drivingshaft C, the feed mechanism isoperated to move the stone under the cutters or chisels e, and at thesame time the spring-arms F, having attached thereto these cutters, areoperated by the hammers E, connected to the eccentric shafts D, drivenby suitable belt-connection with the driving-shaft. The hammers Ebeingthus eccentrically operated admits of a great number of cuts being madeper minute, with no two at the same time, and the stone beingautomatically fed to the cutting apparatus, a uniform and even cuttingis obtained upon its surface, the number of cutters being arranged tosuit the surface-area of said stone.

, To apply my invention to the cutting of rounded surfaces, I employ aboX or tool-holder, K, as shown in Fig. et, adapted to be bolted in theopening G of the bed B, the cutters or chisels being placed in slotsarranged in said box, so that the heads d of the cutter-arms will strikethereon, the faces ofthe cutters or chisels being made to conform withthe surface to be operated upon, and the chisels or cutters for plainsurface cutting removed from their heads. These cutters or chisels areso formed admit, their incline commencing on a level as to haveshoulders i, which come against projections in the slots, to preventthem from dropping through when the stone is not in position to beoperated upon.

As the cutters are struck by the hammer very rapidly their rebound willcarry them up sufliciently above the stone as not to interfere Wit-h itsforward movement; but, if de sired to increase this rebound, springs l;may be interposed between the shoulders of said cutters and the projeetions in the slots.

Having now fully described my invention7 what I claim as new, and desireto secure by Letters Patent, is-

l. In a stone-cutting machine, the bed B, having a central opening, G,andthe sliding blocks g, operated by levers 71, in 'combination with thepivot-ed spring cutter-arms I?, p1o vided with heads d, and carrying thecutters www@ or ehiscls7 and the slirings b, located under said arms,thc hammers E, connected to the bed by pivoted lvokcs c, and constructedto operate substantially as and for the purpose set forth.

2. The combination, with a stone-cutting machine, having secured theretoa bed, B, provided with a central opening, spring-arms F, hammers E, andsliding blocks y, ol' the tool-holder K, having springs la, and thecutters or chisels, having shoulders i, substantially as and for thcpurpose set forth.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two Witnesses.

XVIIEELER PERKINS.

Vitnesscs:

.Turns Ii. (lnossLiiY, CHARLns L'. BELL.

